Portable computer



FIG. 1 is a top view of a portable computer showing our new design;

FIG. 2 is a top view of a second embodiment thereof;

FIG. 3 is a top view of a third embodiment thereof;

FIG. 4 is a top view of a fourth embodiment thereof;

FIG. 5 is a top view of a fifth embodiment thereof; and,

FIG. 6 is a top view of a sixth embodiment thereof.

The portion of the portable computer shown in gray shading in FIGS. 2, 4, and 6 represents a metallic surface. The dot-dash broken lines represent an unclaimed border of the claimed design. The dashed broken lines represent environmental subject matter that forms no part of the claimed design. 

The ornamental design for a portable computer, as shown and described. 